Volume 6, Issue 12 (11-2016)
JRSM 2016, 6(12): 45-56 |
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abdoli B, ahmadi N, ghazi A. Effects of vision and amount of practice on accuracy and kinematic of dart throwing “Study of the specificity of practice hypothesis”. JRSM 2016; 6 (12) :45-56
URL: http://jrsm.khu.ac.ir/article-1-2461-en.html
URL: http://jrsm.khu.ac.ir/article-1-2461-en.html
Abstract: (8321 Views)
According to Specificity of practice hypothesis, availability of visual information
specially during performing tasks witch vision has an important role in improving
the accuracy, causes further performance decrements in No-vision transfer test.
The purpose of the current study was to examine the effects of vision and amount
of practice on accuracy and kinematic of dart throwing. 20 female students of righthanded
who were all novitiate in the skill selected voluntarily and randomly
assigned to full vision and No-vision groups.The subjects following participated in
pretest, performed acquisition phase that consisted two level of modest and
extensive practice (45 trials and 300 trials). 10 minutes after each level of practice,
participants completed transfer trials in a no-vision and no-KR condition. Overall,
Mixed ANOVA (2×3) in acquisition phase revealed that vision improved Dart
throwing accuracy performance. Kinematic analysis revealed no significant
difference between two groups in Wrist flexion, Angular displacement of elbow and
Angular displacement of shoulder. Whereas after 300 trials of practice, there was
significant difference between groups in throwing time and angular velocity of the
dart. After extensive practice, Mixed ANOVA (2×2) showed that, withdrawal of
vision resulted in specificity of practice effects on dart throwing accuracy, but
results of kinematic pattern, regardless of the amount of practice did not support
specificity of practice.
Keywords: Accuracy of dart throwing, kinematic of dart throwing, specificity of practice hypothesis, amount of practice
Type of Study: Research |
Subject:
motor behavior
Received: 2017/04/7 | Accepted: 2017/04/7 | Published: 2017/04/7
Received: 2017/04/7 | Accepted: 2017/04/7 | Published: 2017/04/7
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